Here are the necessary steps for completing this.
1. take the estimated number and subtract it from the actual number EXAMPLE: 5.75-6.25 = -0.5
2. then take the answer and multiply it by 100%
EXAMPLE: -0.5*100 = -50
3. next take the multiplied answer and divide it by the actual number
EXAMPLE: -50÷6.25 = -8
4. finally take the answer and absolute value it then put the number as a percent
EXAMPLE: -8=8 8=8%
your answer is 8%
